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Putting this as simply as possible, do we think a 32” Jersey Barrier can accomplish the intended goal below?
Maria E. Ruppe, P.E.
Roadway Standards Engineer
Ohio Department of
Mail Stop 1230
1980 W. Broad St.
Columbus, OH 43223
From: French, Lynn
I was referred to you by David
The Ohio Fire Code (OFC) requires
(d) Set with
I have quickly looked thru your Roadside Safety Field Guide
The request is to allow the barriers (jersey barriers
Any input to these proposed type barriers being equivalent
Thanks for your input
|Date||July 28, 2014|
The spec below is specific in terms of height, but not very specific in any other way when regarding the specification for other barrier types. The height is limited to a minimum of 36”. Without further knowledge of the intent of the specification, I don’t believe that we could justify going any lower.
In terms of the forces, the spec lists a set load at a height of 36” that the barrier must resist. However it is unclear if the barrier is allowed to deflect or not. Free-standing 32” tall barriers would deflect significantly under that type of load at the top of the barrier and would not be a good fit for this application. Permanent parapets would not deflect appreciably depending on the design, as most of the TL-3 or TL-4 parapet design have withstood crash test impact loads of over 60 kips.
Thus, in short, a permanent 36” tall or taller NJ shape, single-slope, or vertical barrier that we use for roadside safety with appropriate anchorage and footing would likely withstand that loading. Vertical barriers would likely be more appropriate for the application as they would produce less vehicle climb and extension and are more typically used in this type of protection scheme.
I am not sure if that answers you question. Let me know if you need more information.
|Date||July 28, 2014|
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